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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e09222835a33f4bdfb1c63747f70260c6046d2791ba50859bd82febc29b6a3bc' 
  AND token = 'MS6+EuYgSZe53CE7vTRxh6Upq/YIW+SItg2W7IEV87Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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