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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cab72fe965c66d59f6e13d66401b7414832623f76216947817dcee1acb163a2' 
  AND token = 'xmrNyJ+b2wUMJdnY9R/AWuMO6nLA6YxftN857o4abQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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