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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da50f224f7dfdbc2bcadb24350c4748e235989956c8d614e74d55e36cc14cdea' 
  AND token = 'C7WutI4Ce0u/Dvpb0JEISJ2W24zQASLYoZW1qycdClo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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