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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c64af8caed84e2bb6fd6c7d302dcd7aebf6eb7be4f09a9ff8bb77e2119d8aad' 
  AND token = 'LRr9PleAqgOK68AaH5if0zWrC3ndQws5tD5+sk0telw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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