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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aadd4a14fb373fbcf273de0cc29617aecd444e8d23ede731749a3fb06da53df' 
  AND token = 'iQt/3ldMqK9ZJs/Fy/XBivFUWaprj4JOw6wxET+MEIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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