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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1db9941d2b3df960a07acd3a98f07faaaf45c60deca39dcbbbf50ba07a8fcb9' 
  AND token = 'dv8OeyTqISPiYRhjCvbdgHgsJdo3FS5K6lSfz0BjrvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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