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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4797ccd7bba3c217615ae92a443a2fc3aca99e3ac27b29b9a7f746589d7c54c' 
  AND token = 'W7SnQGWi5eV2kJ0pPl3/xnw2Z/FiamKrJSnOLwgR0g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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