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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d18fe2ded233f64bfafcf544801a6b1d8324228c4910a0cdff95f1450c81de8' 
  AND token = 'ARzhz0gjVJBp9qaF7kkAEg7H/QQAQfX5fMvZdbd7I7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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