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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc198c0263304cd1d6820b687e444d20697c31d0af0290d6f8f4407b581ed615' 
  AND token = 'K9R6KZ6opDO1KMiBds/nm5VkJomLd+xBm+OBXOoCKE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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