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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b61d21cf00334ffa6f08c3965b2f03a4a1a634c77ae0f17d5311868d9381d6f' 
  AND token = 'JDyFW4Cnlun2+OOal0bv0ghp82csEQ65sIoU8ragXsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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