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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f92641b03f2ac2538b0ae17aa1f157772b177d625983ade8fc1edc5e311ef5e' 
  AND token = '22XFGSA3v6IERFbRQoFTfwDGtB84uhZSS3o8JTDokUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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