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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aab43daa8cb7a48b2d910c3cab07369ed92c4d4ff20d957dd9d458b5587844f' 
  AND token = 'RLe+yxiZz2hIs08U2/03y8WPsPHD64rru9+wW3poAtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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