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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54b7bc7c5959e5ac624c5dc8127dadf8e2f6d35ccf81ea9fc8db044386e2fedc' 
  AND token = 'n25clZyZJdhpwhrGaQ3C/ete9VTRH30NsDYhMxkIN30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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