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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6dcff9b8bc83688d4240290241504fd890c0939c3c94b7aa65e1a046e668a90' 
  AND token = 'Vlp/vTbFqyEHzE1q5d9bVzx4mPXEOLViJbilHxvC+WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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