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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c4722341018d7c28edae52922c9f704b668193cf547f1931074f9de2ed955a5' 
  AND token = '+vTaL7wRlT1xPcpJn94tiOhCkTBup9Ppui0K6DvFCu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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