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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d304e831f4bd5a24792f64f518c8fc96749daf94a8a59b9a56e3e3b992e39e4' 
  AND token = 'prjkYi0b78ibc9F6VstjgsT9Xx6caeer2RzxF7qc/4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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