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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57bc6177bca1d579af4caccbfdcfbb03ca6957e7689e0e7d5bcacb7f7f576ce3' 
  AND token = 'Zt1s4z1pyIe5LLN5Jpw7COyK3gWg5qwEbEfnAhlxq3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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