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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9369a110377ebc9fbcdac969041f6b905aa46e146690c3b5d7d8482fa413536' 
  AND token = 'fbxrC9+hzTGVUdIrqiZVbf8MquGFIgG8zII2c12qvfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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