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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '814f5fe56ef003132262130563534c8d3192e3e1cf4c0a99c84fdaea7aafce69' 
  AND token = '/lhcK0uICt5bMa0MfVxACOYsy44OCKCHI6pC3RW4yTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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