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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '125156462444438f7b6ad0841608907b2e3eff226513da8a6da5812798e227b4' 
  AND token = 'v181/CjOP2RCjLjEBW5FGeu7mBB2VWiZVwCnJtrDBD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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