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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0cb172cc1b1b11096a5c635155fd8b630b0bc03ece241c169951e1a6ecd30e4' 
  AND token = 'XdXmyCHY/6wPidFuNnE3W+UqJcx1uXR26J9qEfBILDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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