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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afb223161e682a71d8f6a6dbae99406579970038b7809e1b68778b8c92d9b397' 
  AND token = 'Y4ZNuEpdqKNHd0RCZQEu6/3PxTQNbysrovtbr094nWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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