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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f00d27e6e306d3cb4be352ef42d6a74ddb72c41c05179cd9b6583e3646c9f9d5' 
  AND token = 'l9cX1QeQmCmzQqi7nfvL7lgL/Ka8Hm9lljmp197wH6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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