SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2abb7186fc5f09ed77e873e9559c81d1bfae5383433ead95fcab140597b32f1d' 
  AND token = '/YZxCipXIpI6+4lfAa1RwqBmPR1GM4+FvGuh2XJVLG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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