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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcfaa73acbd7e233e2fb0cef87f6a60ab407a0e43d496deaf098599ae5012c30' 
  AND token = 'dO+Iis310e6qPk/9M3aX74OFINtA0wh/XJhlLqVasqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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