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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5581639e8bfe61766117bb7a5ab0195f0ed5378447ed9cccc4cce4ac080a2b06' 
  AND token = 'N71SKSvp/Q5brNPOukEMe13MNq5+e3q0qS/fhf0ZSnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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