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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70bfef6088c1b66dda8ada925a056df6170ce8d7e03d393b8cdecdf87fecc34f' 
  AND token = 'd/1wz99mQNT6U/xX2kEClOyqD5ZtePbKKA14LcfZKPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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