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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b95292b778583ccb91d61c1e7d7b6bf0e2e6c710d275fb8666c40d9720183a6' 
  AND token = 'NZhxdrYYcSQVrhdhtv8tpLVA8GsrJoo9uQSCbq4v4/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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