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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b4d656926e09a186cc76e81d39f0cecc0f208b47dec970ad78a9243c7e21d5' 
  AND token = 'ou+EMIo/KYZsi5FSMRAN1msvG6o/7VkLrcZf3GPHkhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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