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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f25ab66f776e4a8a18d1115685096c854b6b37c363739760a67f55b43e3848' 
  AND token = '3Umg/lSijj9IkP99nPTcx4PNYJb22crsInAYwFWn9+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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