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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87af34a5ee09bffea78c93ea18ef4e485a1f9562d1551b4ed536013e455249ef' 
  AND token = 'x7e/XXcbPXHDH+YdENN4YSRVPWxZgEAx1E8omNiu3b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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