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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f269db59c623e88a6b3d2fe323c12fb0367fbd1a5871eda3e4cd1f66ea4762b9' 
  AND token = 'ZwJWNVpNYIEZE7F2JzN4rG2FP5IZolilRTwXXB84p2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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