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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b7a90398e3d56cf272e06aeb531898b8dda68d59b52a909243779394d24acf4' 
  AND token = 'TZ9fznDvhEADOE36E/e1bsUIBbUTJZbhZzjQDXFA5Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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