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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ffe379965e9c44ff7e1019be605d3d7fdfb2fd830751192a4ce0fca42e4f0da' 
  AND token = 'xiz72l2sloD3YhqiobrNp14I7Ryb8z83mCyX+lWNZBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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