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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '407b1f2f0bc564c73b440c6763eda53ead3285f91d6c0a895b4de6d4062f1f97' 
  AND token = '0Ny2q34KtNOi7BAW0w/MVccrWVg/paPpAg/IoVhQAlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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