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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa9c600810ceda67c2efb22e6dfe81c11d9d01fd3c1031eb4ac9595cdab95039' 
  AND token = '+BQnZuCyWAy302S3vAUhN86vyff1xxBlA1N9DUAFW34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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