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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808d13d39771c73e5cb2d064c7279ec7333dc2ddf52af9b385590800e85e8e98' 
  AND token = 'AhB+fc/FLW73p6qzMcrxi7gbIlXpYljnaaQKywSUEXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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