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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a91892654d3143f6876ac137f9df12a7b60c9a7f499d6a06859f3e5b239cb0eb' 
  AND token = '6NGIcUcQTtSxone48aWkG5YDZ1MiSCIwj4qnErksi18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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