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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9141ff901084b11183b455fb6fa8530a22e0e577dcf6ddc96c320234cf27e903' 
  AND token = '5LyNgWYxfIJyyE62IQDAY5VuDY+1Xmr0+zKYRy2ShDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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