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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e959695feea71cf32d2dd372ea4e4663067b035e4a6d8b3ff3e9060a159eee83' 
  AND token = '4qf0/2jfm42TfYo0CI4wkTPeXDmybCdxIF/m9rpgLLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}