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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b5aa33cd1e8278eadc7388efa80c32ca284ca269867cb759397e859c5f3703b' 
  AND token = 'cR+pLBw+8DOowUKZ+sgt8Jdkhnq1qTlyzNCklDdQ+5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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