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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13860af118b11b00f196b57da96115f79418ae21cc7f241ad4c21c0dc41cea10' 
  AND token = 'UXP10kZfmHykRmOhHNUt/ADIHf6rM8pKS06k77O0SLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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