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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84747eaf6365b94f86c5b36781e2a9cdad0cff5685f4a02ff13649cccd9ba6af' 
  AND token = 'uuZOIIJJnJbefbEOg3NPZAOcvcof7ckp6+9rRBbsT0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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