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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62dc91970fa725f45f651d58744e2f995b179721e1f87559acf76f2f92ced460' 
  AND token = '6/r2eP+aKd67/IvVEFCH7h2O1DlzwYt9U3pjlO4elMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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