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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d41bc88cda012ad7f53873600efac7336657324cf6dc676c0ccdabc3e1ebbdf' 
  AND token = 'dFciDkgeF0bOgS1BWmfqi9XkGw04JZwl+yR98Kicwto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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