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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efa3968373835e313626445da690fc46c033d15fa7bbbfba4a369bd11700aff5' 
  AND token = 'Y7yzkV2ZIq7kztEL7Xr00AdioWsrfvN0MNdAzm12sMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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