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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2659fb8ae98500496b1960d12664db914c1dc0f09f81a307c76455c3b207dffe' 
  AND token = 'DlFMrxMEhxP97CEUTp7oBILsCs+nBOKar0TplWtkoo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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