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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '119cb7c4e49192f5617e0f03b68f4bae6d449c6c4c3ccf0318da27f053d23077' 
  AND token = '7slsy+tzQ+O9286KX+4QyUk1bYsm+RJ8txjDt3Z5g1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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