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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c041fbb9e1658e9046610b4ac9bb773fab26128f150b8e8ec24355dbb24aac40' 
  AND token = 'xfiEbX/U5eaZ+EprCDIyXn3St3+iEdcXGIU7+CktS6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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