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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8061287f0099f5499c01126f46acc65cb8a68d233e6048a993fb4a28dd248ee' 
  AND token = 'J6EVs8+0srJ4fOmr0jZ2mQAnvC7Sq8Iu4oZxDmDF+xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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