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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dba7b120a102129aec7d89f55f4e23499c2c0e773412ee919dece4c9de475f8' 
  AND token = 'LokWZOVKM15plMkSbEtWEGpRXKy0vW0H0h8k0a4I6lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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