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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0b71bad1e1d18370d4a093a8ac64d8d43fe19bca037faeb68a1b4bcd8af5bd0' 
  AND token = 'f01wcNK8XkWKV4zRaNuut1RpVpe1mCf9xeGw39qYoqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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