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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1388013c630df7d0b67c67fb5a6bcc50ea22e8fb1427c0d9c3a261daee2416dd' 
  AND token = 'n2g2BDQ7t/MCd1va2sPn53nX8e6IZRVq/+Zd0MyLqrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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